. >> reporter: neither does retired fbi agent john anthony who worked the hoffa case. he gives the tip zero credibility. >> whether they find a body or not i don't know. if they do, i guarantee you it is not jimmy hoffa. >> reporter: he says they have a good idea who pulled off the hit and where but it sure isn't in this neighborhood. >> reporter: why could the fbi never find the body? >> because there is nobody. the body in our opinion was cremated or thrown into a vat of acid. >> reporter: whatever happened the mafia backed teamster boss is legendary sell braid in moce movies like this one going up against robert kennedy. >> i don't need that and my -- >> reporter: tips had him buried in settlement near the end zone of old giants' stadium and the floorboards dug up of a detroit home and horse farm. still trying to pinpoint why his fate still captivates so many people. >> he was a gifted individual, powerful, negotiate. combine that with his mysterious disappearance and the connection with the underworld and the mob. >> reporter: now, the question is will police crack